Which best describes the atmosphere of the early Earth? A.
Little or no oxygen, mostly carbon dioxide, water vapor, and nitrogen
B.
Little or no carbon dioxide, mostly oxygen, water vapor, and nitrogen
C.
Little or no water vapor, mostly oxygen and carbon dioxide, with some nitrogen
Large amounts of hydrogen cyanide with low amounts of carbon dioxide and oxygen
D.

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Archaebacteria use for movement. celia flagella pili cell walls

Are gametes exactly the same? explain why or why not?